File: [local] / src / usr.bin / make / compat.c (download)
Revision 1.62, Sat Oct 27 08:44:12 2007 UTC (16 years, 7 months ago) by espie
Branch: MAIN
Changes since 1.61: +6 -6 lines
fix indentation
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/* $OpenPackages$ */
/* $OpenBSD: compat.c,v 1.62 2007/10/27 08:44:12 espie Exp $ */
/* $NetBSD: compat.c,v 1.14 1996/11/06 17:59:01 christos Exp $ */
/*
* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
* Copyright (c) 1988, 1989 by Adam de Boor
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "config.h"
#include "defines.h"
#include "dir.h"
#include "engine.h"
#include "compat.h"
#include "suff.h"
#include "var.h"
#include "targ.h"
#include "error.h"
#include "str.h"
#include "extern.h"
#include "memory.h"
#include "gnode.h"
#include "make.h"
#include "timestamp.h"
#include "lst.h"
#include "pathnames.h"
static void CompatInterrupt(int);
static int CompatRunCommand(LstNode, void *);
static void CompatMake(void *, void *);
static int run_gnode(GNode *);
static void setup_meta(void);
static char **recheck_command_for_shell(char **);
static void run_command(const char *, bool);
static volatile sig_atomic_t interrupted;
static void
CompatInterrupt(int signo)
{
if (interrupted != SIGINT)
interrupted = signo;
}
/* The following array is used to make a fast determination of which
* characters are interpreted specially by the shell. If a command
* contains any of these characters, it is executed by the shell, not
* directly by us. */
static char meta[256];
static void
setup_meta(void)
{
char *p;
for (p = "#=|^(){};&<>*?[]:$`\\\n"; *p != '\0'; p++)
meta[(unsigned char) *p] = 1;
/* The null character serves as a sentinel in the string. */
meta[0] = 1;
}
static char **
recheck_command_for_shell(char **av)
{
char *runsh[] = {
"alias", "cd", "eval", "exit", "read", "set", "ulimit",
"unalias", "unset", "wait", "umask", NULL
};
char **p;
/* optimization: if exec cmd, we avoid the intermediate shell */
if (strcmp(av[0], "exec") == 0)
av++;
for (p = runsh; *p; p++)
if (strcmp(av[0], *p) == 0)
return NULL;
return av;
}
static void
run_command(const char *cmd, bool errCheck)
{
const char *p;
char *shargv[4];
char **todo;
shargv[0] = _PATH_BSHELL;
shargv[1] = errCheck ? "-ec" : "-c";
shargv[2] = (char *)cmd;
shargv[3] = NULL;
todo = shargv;
/* Search for meta characters in the command. If there are no meta
* characters, there's no need to execute a shell to execute the
* command. */
for (p = cmd; !meta[(unsigned char)*p]; p++)
continue;
if (*p == '\0') {
char *bp;
char **av;
int argc;
/* No meta-characters, so probably no need to exec a shell.
* Break the command into words to form an argument vector
* we can execute. */
av = brk_string(cmd, &argc, &bp);
av = recheck_command_for_shell(av);
if (av != NULL)
todo = av;
}
execvp(todo[0], todo);
if (errno == ENOENT)
fprintf(stderr, "%s: not found\n", todo[0]);
else
perror(todo[0]);
_exit(1);
}
/*-
*-----------------------------------------------------------------------
* CompatRunCommand --
* Execute the next command for a target. If the command returns an
* error, the node's made field is set to ERROR and creation stops.
*
* Results:
* 0 in case of error, 1 if ok.
*
* Side Effects:
* The node's 'made' field may be set to ERROR.
*-----------------------------------------------------------------------
*/
static int
CompatRunCommand(LstNode cmdNode, /* Command to execute */
void *gnp) /* Node from which the command came */
{
char *cmdStart; /* Start of expanded command */
bool silent; /* Don't print command */
bool doExecute; /* Execute the command */
bool errCheck; /* Check errors */
int reason; /* Reason for child's death */
int status; /* Description of child's death */
pid_t cpid; /* Child actually found */
pid_t stat; /* Status of fork */
char *cmd = (char *)Lst_Datum(cmdNode);
GNode *gn = (GNode *)gnp;
silent = gn->type & OP_SILENT;
errCheck = !(gn->type & OP_IGNORE);
doExecute = !noExecute;
cmdStart = Var_Subst(cmd, &gn->context, false);
/* How can we execute a null command ? we warn the user that the
* command expanded to nothing (is this the right thing to do?). */
if (*cmdStart == '\0') {
free(cmdStart);
Error("%s expands to empty string", cmd);
return 1;
} else
cmd = cmdStart;
if ((gn->type & OP_SAVE_CMDS) && (gn != end_node)) {
Lst_AtEnd(&end_node->commands, cmdStart);
end_node->type &= ~OP_DUMMY;
return 1;
} else if (strcmp(cmdStart, "...") == 0) {
gn->type |= OP_SAVE_CMDS;
return 1;
}
for (;; cmd++) {
if (*cmd == '@')
silent = DEBUG(LOUD) ? false : true;
else if (*cmd == '-')
errCheck = false;
else if (*cmd == '+')
doExecute = true;
else
break;
}
while (isspace(*cmd))
cmd++;
/* Print the command before echoing if we're not supposed to be quiet
* for this one. We also print the command if -n given. */
if (!silent || noExecute) {
printf("%s\n", cmd);
fflush(stdout);
}
/* If we're not supposed to execute any commands, this is as far as
* we go... */
if (!doExecute)
return 1;
/* Fork and execute the single command. If the fork fails, we abort. */
switch (cpid = fork()) {
case -1:
Fatal("Could not fork");
/*NOTREACHED*/
case 0:
run_command(cmd, errCheck);
/*NOTREACHED*/
default:
break;
}
free(cmdStart);
/* The child is off and running. Now all we can do is wait... */
while (1) {
while ((stat = wait(&reason)) != cpid) {
if (stat == -1 && errno != EINTR)
break;
}
if (interrupted)
break;
if (stat != -1) {
if (WIFSTOPPED(reason))
status = WSTOPSIG(reason); /* stopped */
else if (WIFEXITED(reason)) {
status = WEXITSTATUS(reason); /* exited */
if (status != 0)
printf("*** Error code %d", status);
} else {
status = WTERMSIG(reason); /* signaled */
printf("*** Signal %d", status);
}
if (!WIFEXITED(reason) || status != 0) {
if (errCheck) {
gn->made = ERROR;
if (keepgoing)
/* Abort the current target,
* but let others continue. */
printf(" (continuing)\n");
} else {
/* Continue executing commands for
* this target. If we return 0,
* this will happen... */
printf(" (ignored)\n");
status = 0;
}
}
return !status;
} else
Fatal("error in wait: %d", stat);
/*NOTREACHED*/
}
/* This is reached only if interrupted */
if (!Targ_Precious(gn)) {
char *file = Varq_Value(TARGET_INDEX, gn);
if (!noExecute && eunlink(file) != -1)
Error("*** %s removed\n", file);
}
if (interrupted == SIGINT) {
signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
signal(SIGHUP, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
interrupted = 0;
run_gnode(interrupt_node);
exit(SIGINT);
}
exit(interrupted);
}
static int
run_gnode(GNode *gn)
{
if (gn != NULL && (gn->type & OP_DUMMY) == 0) {
Lst_ForEachNodeWhile(&gn->commands, CompatRunCommand, gn);
return gn->made;
} else
return NOSUCHNODE;
}
/*-
*-----------------------------------------------------------------------
* CompatMake --
* Make a target.
*
* Side Effects:
* If an error is detected and not being ignored, the process exits.
*-----------------------------------------------------------------------
*/
static void
CompatMake(void *gnp, /* The node to make */
void *pgnp) /* Parent to abort if necessary */
{
GNode *gn = (GNode *)gnp;
GNode *pgn = (GNode *)pgnp;
if (pgn->type & OP_MADE) {
(void)Dir_MTime(gn);
gn->made = UPTODATE;
}
if (gn->type & OP_USE) {
Make_HandleUse(gn, pgn);
} else if (gn->made == UNMADE) {
/* First mark ourselves to be made, then apply whatever
* transformations the suffix module thinks are necessary.
* Once that's done, we can descend and make all our children.
* If any of them has an error but the -k flag was given,
* our 'make' field will be set false again. This is our
* signal to not attempt to do anything but abort our
* parent as well. */
gn->make = true;
gn->made = BEINGMADE;
Suff_FindDeps(gn);
Lst_ForEach(&gn->children, CompatMake, gn);
if (!gn->make) {
gn->made = ABORTED;
pgn->make = false;
return;
}
if (Lst_Member(&gn->iParents, pgn) != NULL) {
Varq_Set(IMPSRC_INDEX, Varq_Value(TARGET_INDEX, gn),
pgn);
}
/* All the children were made ok. Now cmtime contains the
* modification time of the newest child, we need to find out
* if we exist and when we were modified last. The criteria
* for datedness are defined by the Make_OODate function. */
if (DEBUG(MAKE))
printf("Examining %s...", gn->name);
if (!Make_OODate(gn)) {
gn->made = UPTODATE;
if (DEBUG(MAKE))
printf("up-to-date.\n");
return;
} else if (DEBUG(MAKE))
printf("out-of-date.\n");
/* If the user is just seeing if something is out-of-date,
* exit now to tell him/her "yes". */
if (queryFlag)
exit(-1);
/* We need to be re-made. We also have to make sure we've
* got a $? variable. To be nice, we also define the $>
* variable using Make_DoAllVar(). */
Make_DoAllVar(gn);
/* Alter our type to tell if errors should be ignored or things
* should not be printed so CompatRunCommand knows what to do.
*/
if (Targ_Ignore(gn))
gn->type |= OP_IGNORE;
if (Targ_Silent(gn))
gn->type |= OP_SILENT;
if (Job_CheckCommands(gn, Fatal)) {
/* Our commands are ok, but we still have to worry
* about the -t flag... */
if (!touchFlag)
run_gnode(gn);
else
Job_Touch(gn, gn->type & OP_SILENT);
} else
gn->made = ERROR;
if (gn->made != ERROR) {
/* If the node was made successfully, mark it so,
* update its modification time and timestamp all
* its parents.
* This is to keep its state from affecting that of
* its parent. */
gn->made = MADE;
/* This is what Make does and it's actually a good
* thing, as it allows rules like
*
* cmp -s y.tab.h parse.h || cp y.tab.h parse.h
*
* to function as intended. Unfortunately, thanks to
* the stateless nature of NFS (and the speed of
* this program), there are times when the
* modification time of a file created on a remote
* machine will not be modified before the stat()
* implied by the Dir_MTime occurs, thus leading us
* to believe that the file is unchanged, wreaking
* havoc with files that depend on this one.
*/
if (noExecute || is_out_of_date(Dir_MTime(gn)))
gn->mtime = now;
if (is_strictly_before(gn->mtime, gn->cmtime))
gn->mtime = gn->cmtime;
if (DEBUG(MAKE))
printf("update time: %s\n",
time_to_string(gn->mtime));
if (!(gn->type & OP_EXEC)) {
pgn->childMade = true;
Make_TimeStamp(pgn, gn);
}
} else if (keepgoing)
pgn->make = false;
else {
if (gn->lineno)
printf("\n\nStop in %s (line %lu of %s).\n",
Var_Value(".CURDIR"),
(unsigned long)gn->lineno,
gn->fname);
else
printf("\n\nStop in %s.\n",
Var_Value(".CURDIR"));
exit(1);
}
} else if (gn->made == ERROR)
/* Already had an error when making this beastie. Tell the parent
* to abort. */
pgn->make = false;
else {
if (Lst_Member(&gn->iParents, pgn) != NULL) {
Varq_Set(IMPSRC_INDEX, Varq_Value(TARGET_INDEX, gn),
pgn);
}
switch (gn->made) {
case BEINGMADE:
Error("Graph cycles through %s\n", gn->name);
gn->made = ERROR;
pgn->make = false;
break;
case MADE:
if ((gn->type & OP_EXEC) == 0) {
pgn->childMade = true;
Make_TimeStamp(pgn, gn);
}
break;
case UPTODATE:
if ((gn->type & OP_EXEC) == 0)
Make_TimeStamp(pgn, gn);
break;
default:
break;
}
}
}
void
Compat_Run(Lst targs) /* List of target nodes to re-create */
{
GNode *gn = NULL; /* Current root target */
int errors; /* Number of targets not remade due to errors */
signal(SIGINT, CompatInterrupt);
signal(SIGTERM, CompatInterrupt);
signal(SIGHUP, CompatInterrupt);
signal(SIGQUIT, CompatInterrupt);
setup_meta();
/* If the user has defined a .BEGIN target, execute the commands
* attached to it. */
if (!queryFlag) {
if (run_gnode(begin_node) == ERROR) {
printf("\n\nStop.\n");
exit(1);
}
}
/* For each entry in the list of targets to create, call CompatMake on
* it to create the thing. CompatMake will leave the 'made' field of gn
* in one of several states:
* UPTODATE gn was already up-to-date
* MADE gn was recreated successfully
* ERROR An error occurred while gn was being
* created
* ABORTED gn was not remade because one of its
* inferiors could not be made due to errors.
*/
errors = 0;
while ((gn = (GNode *)Lst_DeQueue(targs)) != NULL) {
CompatMake(gn, gn);
if (gn->made == UPTODATE)
printf("`%s' is up to date.\n", gn->name);
else if (gn->made == ABORTED) {
printf("`%s' not remade because of errors.\n",
gn->name);
errors++;
}
}
/* If the user has defined a .END target, run its commands. */
if (errors == 0)
run_gnode(end_node);
}